SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ad75b8b8a12e1f0aeffb3069a4976de7cc9065f9cf08c3e8b225f830b90db77' 
  AND token = 'fGjOPWLqPQWia6KPeZvt/zjudwCfwuqeUflDOwH0X7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}